Secretary of State John Kerry, in an often contentious Senate hearing, told lawmakers the U.S. isn't negotiating a ‘legally binding’ agreement with Iran, meaning future presidents could choose not to implement the accord.

The battle between Congress and the White House over U.S.-led nuclear talks with Iran got nastier Monday as Obama chastised Senate Republicans who wrote directly to Iran’s leaders to criticize U.S.-led nuclear talks.

Sen. Bob Corker (R., Tenn.), at a breakfast sponsored by the Wall Street Journal, said the 2010 health care law's exchanges are a concept that can be built upon, suggesting that if Republicans retake the Senate in November, they might seek to rework rather than gut the Affordable Care Act.

In his State of the Union speech, President Obama repeated his call for Congress to officially endorse the fight against Islamic State forces. Republicans on Capitol Hill say they are waiting for the administration to outline exactly what it wants in a use-of-force authorization.